Ceramic laminate material

Abstract

Ceramic laminate material comprising at least one dense layer of a perovskite material and at least one layer of a dense non-perovskite material and/or at least one layer of a dense superstructural perovskite material.

What is claimed is:  
     
       1. Ceramic laminate material comprising at least one dense layer of a perovskite material represented by the chemical formula: 
       
         
           A x A′ x′ A″ x″ B y B′ y′ B″ y″ O 3−δ   
         
       
       wherein 
       x+x′+x″≦1 and/or y+y′+y″≦1  
       and at least one other layer of a dense non-perovskite material and/or at least one layer of a dense superstructural perovskite material. 
     
     
       2. Material according to claim  1 , wherein said other layers are all of a non-perovskite material represented by the chemical formula: 
       
         
           (A x A′ x′ A″ x″ ) a (B y B′ y′ B″ y″ ) b O 3−δ   
         
       
       wherein 
       x+x′+x″≦1 and/or y+y′+y″≦1 and  
       a is a number in a range from 1 to 4  
       b is a number in a range from 1-10 and  
       δ is a number, which renders the composition charge neutral.  
     
     
       3. Material according to claim  1 , wherein said other layers are all of a superstructural perovskite material represented by the Brownmillerite structure having the general chemical formula: 
       
         
           A x A′ x′ A″ x″ B y B′ y′ B″ y″ O 2.5    
         
       
       where 
       x+x′+x″≦1 and/or y+y′+y″≦1  
       or by the pyroclore structure having the general chemical formula: 
       
         
           A x A′ x′ A″ x″ B y B′ y′ B″ y″ O 3.5 .  
         
       
     
     
       4. Material according to claim  1 , wherein A, A′ and A″ each is one or more metals selected from the group consisting of lanthanide metals and/or a divalent metal. 
     
     
       5. Material according to claim  1 , wherein B, B′ and B″ each is a metal selected from the group consisting of transition metals, group IIIA and noble metals of group VIII of the Periodic Table. 
     
     
       6. Material according to claim  4 , wherein said divalent metal is selected from group IIA of the Periodic Table.